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CMX6GX3M3A1600C9 and GA-X58A-UD3R


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Hi people. I hope someone can help me with an issue I have, or perhaps shed some light on the shadow looming over my system. :confused:


I have Gigabyte GA-X58A-UD3R motherboard with an core I7 930 processor. I have 2x packs of CMX6GX3M3A1600C9 memory (12gb) and a Corsair HX850 PSU. Originally the system had 6gb of ram, and it was reasonably stable but would occasionaly (every few days) lockup (the monitor would go blank and the system would become unresponsive) necessitating a reboot.


Essentially since doubling the ram the system will lock up of it's own accord after about 5 -15 minutes (as a rule but It has on occasion managed to get just past an hour). The screen no longer goes blank, but the USB ports just stop working. Even the indicator lights on the hub and the red laser on the mouse just go out. It does this when being used and when it's idle. I won't bore you with the details but essentially it also does this when I am booting and running from the USB drive (active boot disk) and occasionally even when I am in the bios, so I don't think it is an OS problem. In fact, I tried to reinstall windows 7 during my escapade of trouble shooting, and it has beecome so unstable I haven't yet successfully managed to load windows 7 64bit.


I ran some memory tests and they all say the mem is fine. I am thinking about RMA'ing the motherboard, but am not really convinced it is faulty as before the the upgrade it was fine... ish, certainly it only locked up occasionally.


I believe this memory is compatible with this board, and am more inclined to belive some 'tweaking' may be necessry to coerce the system into stability... at least I am hoping so, before (reluctantly) RMA'ing the MB. At any rate, I am wondering if there are any adjustments I could make in the bios, voltages etc.


I Generally... in fact I never tamper with voltages, memory clocks or anything else when I build a system so am a complet novice in that respect. But, I would like to give it a shot here if it may save me some grief.


Sorry for the long post, thanks for any info and suggestions.

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The use of two memory kits even of the same part number is not guaranteed to work, vs. one tested matched kit.


You can check/adjust your BIOS settings to: 11-11-11-30 2T @ 1066 MHz. to see if this helps. The 9-9-9-24 timings are for two modules not four. When using four modules the timings will need to be slower on the modules.


You may also need to adjust the QPI voltage for stablity?

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Sorry I should have said, I have 6 memory modules at 2gb each not 4. There were 3 to a set. What should I adjust them to?


QPI I have seen this in the MIT bias settings, I'm not sure what voltage it is currently as the setting is currently auto. Any idea what I should change his too? I take it I will have to increase this.


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